Pregnant women asked to avoid cannabis in face of poor research

                    <img src='https://i.cbc.ca/1.4638797.1525136028!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/vendor-weighing-herbal-cannabis.jpg' alt='Vendor weighing herbal cannabis' width='460' title='City reviewing recommendation to charge cannabis retailers $2,500 a year for a business licence.' height='259' />                Alberta medical professionals are warning that the upcoming legalization of cannabis may exacerbate the province's problem of premature infants.